Spindle-lock.



L. S. STARRETT. SPINDLE LOOK.

APPLICATION FILED SEPT. 30, 1909.

1,006,508, 3 Patented 0011.24, 1911.

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UNITED STATES PATENT OFFICE.

LAROY S. STARRETT, OF ATHOL, MASSACHUSETTS, ASSIGNOR TO L. S. STARRETTCOMPANY, OF ATHOL, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SPINDLE-LOGK.

To all whom it may concern:

Be it known that I, LAROY S. STARRETT, a citizen of the United States,residing at Athol, county of Worcester, Commonwealth of Massachusetts,have invented certain new and useful Improvements in Spindle-Locks, ofwhich the following is a specification.

This invention relates to a spindle locking device and particularly to aspindle lock for a micrometer, being an improvement over my formerinvention shown in my recent Patent No. 928,889 of July 20, 1909. Inthat patent I described the actuation of a binding roller to look aclamping ring upon a spindle and in that patent showed a mi crometer thespindle of which was so locked.

My present invention involves among other improvements the positiveactuation of the locking piece relative to the clamping ring to securecertainty of motion and permits the omission of the lift spring setforth in that patent.

The present improvement admits of a larger locking piece or roller and,therefore, avoids to a greater extent the possibility of its indentationon the bearing surface of the clamp. This permits a decrease of theexpense of construction as it is not now necessary to harden the springused under the roller as in the patent referred to. A slight variationin the size of the roller moreover does not now affect its operation. Informer devices the role would sometimes stick in the deep part of thenotch in the clamp ring, but in my present improvement the actuation ispositive and certain.

The structure and arrangement for the securing of a positive actuationmay be varied and the actuating member may be attached to the actuatingring in some other manners than I have above suggested. This is to beborne in mind in the following specification in which I have shown as anillustrative embodiment of my invention a micrometer in which thespindle is locked in the manner above suggested.

In the specification which follows I have employed like referencenumerals to indicate corresponding parts throughout and in the drawings-Figure 1 is a micrometer with a portion of its head broken away toexpose the spindle locking means, Fig. 2 is a front elevation similarlybroken, Fig. 3 is a transverse section on the line 3-3, Fig. 1, Fig. 4is a par- Specification of Letters Patent.

Application filed September 30, 1909.

Patented Oct. 24, 1911.

Serial No. 520,415.

tial view similar to Fig. 2 showing a modification of my invention, andFig. 5 is a view similar to Fig. 8 showing the same modification as inFig. 4.

1 is a frame having at 2 a fixed point or stud with relation to which aspindle 3 is moved by any suitable micrometer adjustment which may becontained as usual within the handle 4-.

5 is a bearing or head within which the spindle 3 works and this head istransversely slotted or recessed at right angles to the bearing of saidspindle 3.

Within the recess is located a clamping ring 6 which is preferablysplit, as indicated at 7, and provided with a sloping cam face 8.

9 is a locking piece or looking roller of slightly greater diameter thanthe deepest part of the cam face 8.

10 is an actuating or looking ring encircling the clamping ring 6 andprovided on its inner face with a recess or groove 11 adapted to receivethat portion of the locking piece or looking roller 9 which projectsabove the periphery of the locking ring. It will thus be seen that whenthe locking ring is rotated the roller 9 will be positively carriedalong on the cam face 8 of the clamping ring, thus binding and lockingthe spindle 3 at its position of proper adjustment.

In Figs. 4 and 5 I have shown in a modification a structure in whichthere is substituted for the locking roller 11 the rounded head 12 of arivet 12 set on the inner face of the ring 10. It will be readily seenthat upon the rotation of the ring 10 the rounded head 12 of the rivet12 will be drawn along the cam face 8 of the clamping ring 6, thuspositively locking the spindle 3, as before described.

Various modifications, variations and usages of the device herein shownand de scribed may, of course, be made without departing from the spiritof my invention if within the limits of the appended claim.

What I therefore claim and desire to se cure by Letters Patent is In amicrometer gage, a longitudinal spindle bearing having a transverserecess therein, a spindle rotatably mounted in said bearing, a rotatablering surrounding said spindle and located in said recess, a splitannular clamp disposed within said ring and about said spindle andhaving a cam surface thereon, a rounded locking piece operativelyassociated with said ring to secure a In testimony whereof, I afiix mysignature positive movement in either direction therein presence of twowitnesses. of and adapted to bear upon said cam portion, whereby said,locking piece will be LARO'Y STARREFI" moved in either direction uponthe rotation Witnesses:

of the ring, substantially as shown and de- FRANK E. WING,

scribed. WILLARD G. NIMs.

Copies of this patent may be obtained for five cents each, byaddressing" the Commissioner of Patents, Washington, D. G.

